•Risk of heart problems after stopping Tenoretic (atenolol / chlorthalidone) suddenly
•Risk of heart failure
•Risk of heart block when taken with calcium channel blockers
•Caution use in people with breathing problems
•Kidney problems
•Changes in fluids and electrolytes in the body
•Hidden symptoms of low blood sugar
•Hidden symptoms of overactive thyroid
•Possible gout
•Risk of harm to baby